<template>
  <p class="header">{{ msg }}</p>
</template>

<script>
export default {
  name: "MyHeader",
  data() {
    return {
      msg: "呜呜呜",
    };
  },
};
</script>

<style>
.header {
  width: 50px;
  height: 50px;
  background-color: chartreuse;
}
</style>